Lavender fields cake

For Susan’s birthday today, a cake about biking through fields of lavender:

This is a dream bike ride for Susan, which she has not yet made real. This
cake will have to do for now. It’s just a chocolate cake mix, baked into
a rectangle pan and two mixing bowls. The bottoms of the mixing bowls
became the hillocks. The road is Hershey bars, but she is biking off-road
on the scree of crumbled cookies.